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MFS, Multi-Routing Template System, Page Eight.
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I'm going to start with showing the finished piece for this example so you can see what I am setting up to rout, a cutout with a lip or rebate.
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Step one is to lay out for the pivot point, then drill the pilot hole.
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The next step is to set the insert to rout the proper size circle, the pivot is already installed.
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Before we move to the next step, let me explain the setup process in detail. The insert is set using the scale on the MFS profile and insert's own scale. The insert's scale is not centered on the hole for the copying ring (see picture above), at first that doesn't seem make much sense. But remember the pivot is offset from the profile's scale, this accounts for the insert's offset scale (say that three times fast). Now, take into account the bit, its cutting edges are offset from the zero point on the insert. I know, a lot of offsets here, so let me show you a couple of drawings to help clarify things.
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This drawing is of the insert, the scale is larger in this picture that the real one, this makes it a little easier to see. The first thing to notice, the scale has graduations on both sides of zero. Zero is the centerline of the cut. The graduations above zero (towards the top of this drawing) represent the outside of the cutting radius, also referred to as R2 in this drawing. And the gradations below zero are the inside radius or R1. In this example a 10 mm bit is used, the outside radius is plus 5 mm from zero and the inside radius is minus 5 mm.
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This drawing shows how to set the insert with the MFS scale. With the 10 mm bit, the insert is set to cut a 310 mm outside radius and 300 mm inside radius.
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All right, back to the example, a 10 mm bit is in the router and the insert set to cut a 100 mm outside radius (90 mm inside). My MFT has a piece of scrap down to protect the top, the work piece has two sided tape to hold it down to the scrap. I've dropped the pivot in the pilot hole, set the depth of the bit to 8 mm. Plunge the router and start turning the template on the pivot to rout the circle.
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Here is the result.
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Now I want the center cut out, leaving the lip. I've changed bits, a 6 mm spiral bit now in the router. I'll move the insert to cut a 90 mm outside radius for the 6 mm bit. The depth is set to cut all the way through the stock.
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Remove the center cutout from the two sided tape and that takes us back to the finished piece, the first picture at the top of the page.
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